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hevc_parse.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "bytestream.h"
20 #include "h2645_parse.h"
21 #include "hevc.h"
22 #include "hevc_parse.h"
23 
24 static int hevc_decode_nal_units(const uint8_t *buf, int buf_size, HEVCParamSets *ps,
25  int is_nalff, int nal_length_size, void *logctx)
26 {
27  int i;
28  int ret = 0;
29  H2645Packet pkt = { 0 };
30 
31  ret = ff_h2645_packet_split(&pkt, buf, buf_size, logctx, is_nalff, nal_length_size, AV_CODEC_ID_HEVC, 1);
32  if (ret < 0) {
33  goto done;
34  }
35 
36  for (i = 0; i < pkt.nb_nals; i++) {
37  H2645NAL *nal = &pkt.nals[i];
38 
39  /* ignore everything except parameter sets and VCL NALUs */
40  switch (nal->type) {
41  case NAL_VPS: ff_hevc_decode_nal_vps(&nal->gb, logctx, ps); break;
42  case NAL_SPS: ff_hevc_decode_nal_sps(&nal->gb, logctx, ps, 1); break;
43  case NAL_PPS: ff_hevc_decode_nal_pps(&nal->gb, logctx, ps); break;
44  case NAL_TRAIL_R:
45  case NAL_TRAIL_N:
46  case NAL_TSA_N:
47  case NAL_TSA_R:
48  case NAL_STSA_N:
49  case NAL_STSA_R:
50  case NAL_BLA_W_LP:
51  case NAL_BLA_W_RADL:
52  case NAL_BLA_N_LP:
53  case NAL_IDR_W_RADL:
54  case NAL_IDR_N_LP:
55  case NAL_CRA_NUT:
56  case NAL_RADL_N:
57  case NAL_RADL_R:
58  case NAL_RASL_N:
59  case NAL_RASL_R:
60  av_log(logctx, AV_LOG_ERROR, "Invalid NAL unit: %d\n", nal->type);
61  ret = AVERROR_INVALIDDATA;
62  goto done;
63  break;
64  }
65  }
66 
67 done:
69  return ret;
70 }
71 
73  int *is_nalff, int *nal_length_size,
74  int err_recognition, void *logctx)
75 {
76  int ret = 0;
77  GetByteContext gb;
78 
79  bytestream2_init(&gb, data, size);
80 
81  if (size > 3 && (data[0] || data[1] || data[2] > 1)) {
82  /* It seems the extradata is encoded as hvcC format.
83  * Temporarily, we support configurationVersion==0 until 14496-15 3rd
84  * is finalized. When finalized, configurationVersion will be 1 and we
85  * can recognize hvcC by checking if avctx->extradata[0]==1 or not. */
86  int i, j, num_arrays, nal_len_size;
87 
88  *is_nalff = 1;
89 
90  bytestream2_skip(&gb, 21);
91  nal_len_size = (bytestream2_get_byte(&gb) & 3) + 1;
92  num_arrays = bytestream2_get_byte(&gb);
93 
94  /* nal units in the hvcC always have length coded with 2 bytes,
95  * so put a fake nal_length_size = 2 while parsing them */
96  *nal_length_size = 2;
97 
98  /* Decode nal units from hvcC. */
99  for (i = 0; i < num_arrays; i++) {
100  int type = bytestream2_get_byte(&gb) & 0x3f;
101  int cnt = bytestream2_get_be16(&gb);
102 
103  for (j = 0; j < cnt; j++) {
104  // +2 for the nal size field
105  int nalsize = bytestream2_peek_be16(&gb) + 2;
106  if (bytestream2_get_bytes_left(&gb) < nalsize) {
107  av_log(logctx, AV_LOG_ERROR,
108  "Invalid NAL unit size in extradata.\n");
109  return AVERROR_INVALIDDATA;
110  }
111 
112  ret = hevc_decode_nal_units(gb.buffer, nalsize, ps, *is_nalff, *nal_length_size, logctx);
113  if (ret < 0) {
114  av_log(logctx, AV_LOG_ERROR,
115  "Decoding nal unit %d %d from hvcC failed\n",
116  type, i);
117  return ret;
118  }
119  bytestream2_skip(&gb, nalsize);
120  }
121  }
122 
123  /* Now store right nal length size, that will be used to parse
124  * all other nals */
125  *nal_length_size = nal_len_size;
126  } else {
127  *is_nalff = 0;
128  ret = hevc_decode_nal_units(data, size, ps, *is_nalff, *nal_length_size, logctx);
129  if (ret < 0)
130  return ret;
131  }
132 
133  return ret;
134 }
int ff_h2645_packet_split(H2645Packet *pkt, const uint8_t *buf, int length, void *logctx, int is_nalff, int nal_length_size, enum AVCodecID codec_id, int small_padding)
Split an input packet into NAL units.
Definition: h2645_parse.c:250
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
Definition: hevc.h:97
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
H.265 parser code.
int ff_hevc_decode_nal_sps(GetBitContext *gb, AVCodecContext *avctx, HEVCParamSets *ps, int apply_defdispwin)
Definition: hevc_ps.c:1185
static AVPacket pkt
uint8_t
void ff_h2645_packet_uninit(H2645Packet *pkt)
Free all the allocated memory in the packet.
Definition: h2645_parse.c:371
const uint8_t * buffer
Definition: bytestream.h:34
ptrdiff_t size
Definition: opengl_enc.c:101
#define av_log(a,...)
Definition: hevc.h:113
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int ff_hevc_decode_nal_pps(GetBitContext *gb, AVCodecContext *avctx, HEVCParamSets *ps)
Definition: hevc_ps.c:1428
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:164
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:154
int ff_hevc_decode_extradata(const uint8_t *data, int size, HEVCParamSets *ps, int *is_nalff, int *nal_length_size, int err_recognition, void *logctx)
Definition: hevc_parse.c:72
int type
NAL unit type.
Definition: h2645_parse.h:52
Definition: hevc.h:112
Definition: hevc.h:111
void * buf
Definition: avisynth_c.h:690
GLint GLenum type
Definition: opengl_enc.c:105
static int hevc_decode_nal_units(const uint8_t *buf, int buf_size, HEVCParamSets *ps, int is_nalff, int nal_length_size, void *logctx)
Definition: hevc_parse.c:24
int ff_hevc_decode_nal_vps(GetBitContext *gb, AVCodecContext *avctx, HEVCParamSets *ps)
Definition: hevc_ps.c:397
Definition: hevc.h:98
GetBitContext gb
Definition: h2645_parse.h:47
H2645NAL * nals
Definition: h2645_parse.h:70